Amazon offers its Prime members the KOSS KSC75 Portable Stereo Headphones (pictured), model no. 155540, bundled with $2 MP3 credit for $9.99 with free shipping. (Non-members can spend $35 or more to bag free shipping; otherwise it adds $5.74.) Assuming you use the credit, that's the lowest total price we could find by $7. (For further comparison, we saw it for the same price without the MP3 credit in May.) the lowest total price we could find by $5. These headphones feature sport clip design, 4-foot cable, and 15Hz to 25KHz frequency response.

Amazon also offers Prime members the Koss KTXPRO1 Titanium Portable Headphones, model no. 145517, bundled with a $2 MP3 credit for $9.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.74.) Assuming you use the credit, that's the lowest price we could find by $9. These headphones feature 15Hz to 25kHz frequency response, foam ear cushions, and cord volume control.